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Book The Effects of Habitat on Population Dynamics in an Expanding Population of Grey Seals Halichoerus Grypus on Muskeget Island MA

Download or read book The Effects of Habitat on Population Dynamics in an Expanding Population of Grey Seals Halichoerus Grypus on Muskeget Island MA written by Meagan Sims and published by . This book was released on 2013 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Breeding grey seals (Halichoerus grypus) utilize a variety of terrestrial substrates for parturition, nursing, and mating that vary in topographical characteristics and therefore, the availability of suitable habitat is crucial for the persistence of grey seal populations worldwide. This study compared the effects of habitat type over the course of four breeding seasons on Muskeget Island, Massachusetts within and between years on a suite of population parameters including densities, sex ratios, male harem likelihood and mean harem sizes, pups with and without mothers, nursing events, copulation events, pup mortality, and pup developmental stages. The analysis included the 2007, 2008, 2010, and 2012 breeding seasons and compared two beach and three interior habitat types. I predicted that the predominant pupping habitat type used during the breeding season would be exterior beach types because they were composed of expansive, primarily flat substrate representing the first access points when hauling-out. It was expected that these sites would be the locations used by early arriving females and contain higher densities of all age/sex classes. Areas with higher densities were thought to facilitate a greater number of harems with smaller mean harem sizes, fewer pups with mothers, fewer nursing events, more copulation events, higher pup mortality, and more pups in later developmental stages. Overall, densities for all age/sex classes were significantly higher for exterior open beach and thin beach types compared to interior marsh, back beach grass, and inland types, and the use of interior habitats was higher overall in 2012 than in 2007. Sex ratios became more female biased over the course of the study, and were more heavily femaled biased in interior habitat types. Males were more likely to have harems in open beach types while mean harem sizes were significantly larger in interior habitat types, higher in 2012 than 2007, and significantly positively correlated with adult sex ratios in three out of five habitat types. Densely populated exterior sites had more observed copulation events and pup mortality while no differences in nursing events were found. Additionally, a clear shift in habitat use was evident for the 2010 breeding season for all population parameters. Results suggest the primary use of exterior beach habitats during the initial portion of the breeding season, particularly on the north and west sides of Muskeget, with a progression towards interior habitats throughout the season and the use of interior habitat becoming more prevalent over time. As expected, distinct differences in all population parameters were observed for beach vs. interior habitat use, suggesting habitat type plays a considerable role in the population dynamics of breeding grey seals. To date, little is known regarding this breeding population and this study was the first analysis conducted on Muskeget Island to investigate grey seal pupping habitat choice and its potential effects on population dynamics.

Book Population Dynamics of Seals

Download or read book Population Dynamics of Seals written by Karin C. Harding and published by . This book was released on 2000 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Population Dynamics of Seals

Download or read book Population Dynamics of Seals written by Karin C. Hårding and published by . This book was released on 2000 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Population Dynamics in Variable Environments

Download or read book Population Dynamics in Variable Environments written by Shripad Tuljapurkar and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demography relates observable facts about individuals to the dynamics of populations. If the dynamics are linear and do not change over time, the classical theory of Lotka (1907) and Leslie (1945) is the central tool of demography. This book addresses the situation when the assumption of constancy is dropped. In many practical situations, a population will display unpredictable variation over time in its vital rates, which must then be described in statistical terms. Most of this book is concerned with the theory of populations which are subject to random temporal changes in their vital rates, although other kinds of variation (e. g. , cyclical) are also dealt with. The central questions are: how does temporal variation work its way into a population's future, and how does it affect our interpretation of a population's past. The results here are directed at demographers of humans and at popula tion biologists. The uneven mathematical level is dictated by the material, but the book should be accessible to readers interested in population the ory. (Readers looking for background or prerequisites will find much of it in Hal Caswell's Matrix population models: construction, analysis, and in terpretation (Sinauer 1989) ). This book is in essence a progress report and is deliberately brief; I hope that it is not mystifying. I have not attempted to be complete about either the history or the subject, although most sig nificant results and methods are presented.

Book Ecology Abstracts

Download or read book Ecology Abstracts written by and published by . This book was released on 2000 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coverage: 1982- current; updated: monthly. This database covers current ecology research across a wide range of disciplines, reflecting recent advances in light of growing evidence regarding global environmental change and destruction. Major ares of subject coverage include: Algae/lichens, Animals, Annelids, Aquatic ecosystems, Arachnids, Arid zones, Birds, Brackish water, Bryophytes/pteridophytes, Coastal ecosystems, Conifers, Conservation, Control, Crustaceans, Ecosyst em studies, Fungi, Grasses, Grasslands, High altitude environments, Human ecology, Insects, Legumes, Mammals, Management, Microorganisms, Molluscs, Nematodes, Paleo-ecology, Plants, Pollution studies, Reptiles, River basins, Soil, TAiga/tundra, Terrestrial ecosystems, Vertebrates, Wetlands, Woodlands.

Book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards

Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2006 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Oceanic Abstracts

Download or read book Oceanic Abstracts written by and published by . This book was released on 1997-04 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Dynamics of Recolonization

Download or read book Dynamics of Recolonization written by Stephanie A. Wood LaFond and published by . This book was released on 2009 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Feeding Ecology of the Northwest Atlantic Grey Seal Halichoerus Grypus microform

Download or read book Feeding Ecology of the Northwest Atlantic Grey Seal Halichoerus Grypus microform written by Donald Benoit and published by National Library of Canada. This book was released on 1989 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Marine Mammals Fisheries Tourism and Management Issues

Download or read book Marine Mammals Fisheries Tourism and Management Issues written by Nicholas Gales and published by CSIRO PUBLISHING. This book was released on 2003-10-22 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine Mammals: Fisheries, Tourism and Management Issues brings together contributions from 68 leading scientists from 12 countries to provide a comprehensive, up-to-date review on the way we manage our interactions with whales, dolphins, seals and dugongs. The book examines how we have fared conserving the world’s marine mammal populations, with a focus on the key issues of fisheries and tourism. From a unique southern hemisphere perspective, the authors consider how science informs the culling debate, how wild fisheries and aquaculture interact with marine mammal populations and how we might manage the effects of whale, dolphin and seal watching industries. The authors also address other issues such as the way in which ethics, genetics, acoustics, ecosystem models and pollution influence the management and conservation of marine mammals. Marine Mammals is an invaluable and accessible resource for all those involved with marine mammals, including scientists, managers, policy makers, industry representatives and students. Winner of a 2004 Whitley Award.

Book The Teeth of Mammalian Vertebrates

Download or read book The Teeth of Mammalian Vertebrates written by Barry Berkovitz and published by Academic Press. This book was released on 2018-08-10 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Teeth of Mammalian Vertebrates is an important reference for researchers in dentistry, comparative morphology, anthropology, and vertebrate palaeontology, and those with an interest in exploring and understanding diversity. The book provides a comprehensive and informed analysis of mammalian dentitions and highlights the importance of teeth as drivers and mirrors of evolution and diversity." - Journal of Anatomy The Teeth of Mammalian Vertebrates presents a comprehensive survey of mammalian dentitions that is based on material gathered from museums and research workers from around the world. The teeth are major factors in the success of mammals, and knowledge of tooth form and function is essential in mammalian biology. Illustrated with high-quality color photographs of skulls and dentitions, together with X-rays, CT images and histology, this book reveals the tremendous variety of tooth form and structure in mammals. Written by two internationally-recognized experts in dental anatomy, the book provides an up-to-date account of how teeth are adapted to acquiring and processing food. With its companion volume, this book provides a complete survey of the teeth of vertebrates. It is the ideal resource for students and researchers in zoology, biology, anthropology, archaeology and dentistry. - Provides a comprehensive account of mammalian dentitions, together with helpful reading lists - Illustrated by 900 high-quality photographs, X-rays, CT scans and histological images from leading researchers and world class museum collection - Depicts lateral and occlusal views of the skull and dentition, which conveys a much greater level of morphological detail than line drawings - Contains clear-and-concise, up-to-date reviews of the structure and properties of dental tissues, especially the enamel and tooth support system, both of which play vital roles in the functioning of the mammalian dentition

Book The diet of British grey seals Halichoerus grypus

Download or read book The diet of British grey seals Halichoerus grypus written by P.S. HAMMOND and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Natural History of Seals

Download or read book The Natural History of Seals written by William Nigel Bonner and published by . This book was released on 1990-01-01 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the natural history of this popular animal, focusing on its behavior, relationship to man, and prospects for survival.